Malicious PDF — malware analysis report

Static analysis result for SHA-256 f89f61a08cc31df3…

MALICIOUS

PDF

86.0 KB Created: 2021-06-30 21:44:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6e68a622dafdc0d3e4ba1b80f1606200 SHA-1: 21792d164a31de0a2e253ecf1d2681bc6edff417 SHA-256: f89f61a08cc31df3ee6fd0fd6d92c088699281d976f05b8503fa0911025e18dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with techniques used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=localecompare+is+not+a+function
    • https://client-sms.com/ckfinder/userfiles/files/guropadujasek.pdf
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4fe9193c4---gibuboxatada.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/a0fcd7252076acf610948a09fdfa97bc/pazozigixetewotasanepuka.pdf
    • http://ippon.lv/uploads/File/30822299680.pdf
    • http://varanini.pl/userfiles/file/1141312602.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/90bd352029eb5e3708e96f8cd339e3f7/50726160966.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a2201c6f6ee5d46a4590c502a1e282a/zeravuduged.pdf
    • https://cor.org.ar/wp-content/plugins/super-forms/uploads/php/files/1dqhomuaisv9v7095k22oqhf6j/bekexavedaxavenomupaduti.pdf
    • https://gyandeepjkss.org/userfiles/file/12781833488.pdf
    • http://netinflux.net/userfiles/file/sugefawej.pdf
    • http://qca.ch/userfiles/file/2884027011.pdf
    • http://adamlegal.com/userfiles/file/25608348302.pdf
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/b165318417cc0c306f1eaa05f0f6f069/rukodinifijirimazune.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160801283359d4---vakenaxumisutedu.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fb2990eca4---newuwakimepibusivubej.pdf
    • http://luingpyrex.cz/foto/Image/file/dofogatosoroseto.pdf
    • http://woorymart.com/userData/board/file/1857767666.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/wijizibifunaxodipapukitet.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eef9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF9 16792 bytes
font_01_sfnt_off0001070b.bin
66ca4efa8cddab1e8aaf8bdaf411df56985b71f383499f570243d06c54ae75c4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1070B 16824 bytes
font_02_sfnt_off000132be.bin
ad310cb38b7648825cff498531a32411485d64842544e8ffb8d7d50bac9adad1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132BE 10696 bytes

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